What My Bones Know: A Memoir of Healing from Complex Trauma

by Stephanie Foo

At the Emory University School of Medicine in 2013, researchers conducted an experiment with male mice.[1] They exposed the mice to the smell of cherry blossoms, then gave them an electric shock. The mice came to associate the smell of cherry blossoms with danger. Eventually, the mice were able to identify the smell at trace concentrations. The smell receptors in their brain enlarged—they changed to identify the scent. Researchers even identified changes in the mice’s sperm. Then, after the mice had offspring, the researchers exposed this next generation of mice to the cherry blossom scent. Despite the fact that these mice had never smelled cherry blossoms before and had never been shocked, they still shuddered and jumped when it wafted into their cages. This generation of mice had inherited their parents’ trauma.

Yet another study by the Brain Research Institute of the University of Zurich in 2011 exposed baby mice to stressful situations by separating them from their mothers.[2] The abandoned mice experienced anxiety and depression—which, right, seems obvious. What was shocking was how this separation affected future generations of mice. When the traumatized mice had babies, and then when their babies had babies, the scientists never separated them from their parents. They led perfectly content, nurtured little mouse lives. But for three subsequent generations, the anxiety and depression persisted.